TW202312868A - Spinning reel - Google Patents

Abstract

A spinning reel includes a spool shaft movable in a front-rear direction with respect to a reel body, a spool connected to the spool shaft and configured to have a fishing line wound therearound, a pinion gear supported by the reel body so as to be rotatable, a reciprocating mechanism configured to move the spool shaft in reciprocating fashion in the front-rear direction, and an intermediate gear disposed between the pinion gear and the reciprocating mechanism, the intermediate gear reducing rotation of the pinion gear, and transmitting rotation to the reciprocating mechanism. A value obtained by dividing a stroke distance of the spool shaft by a winding pitch of the fishing line and a module (M) of the intermediate gear is greater than or equal to 60, the module (M) being a diameter of a pitch circle relative to a number of teeth of the intermediate gear.

Description

Spinning reel

The present invention relates to a spinning wheel type reel.

It is known that in the spinning reel, various problems occur at the dead point when the spool reciprocates back and forth, that is, the position where the spool is arranged at the front and the position where the spool is arranged at the rear. For example, when the fishing line is released, the fishing lines come into contact with each other at the dead point, noise is generated and the resistance of the fishing line to be released becomes large. It is known that by this, the flight distance is reduced. Therefore, in order to solve the problem of the dead point, a technique of increasing the diameter of the spool, a technique of prolonging the reciprocating stroke of the spool (see, for example, Patent Document 1), and a technique of thinning the winding pitch of the fishing line (see, for example, Patent Document 2). [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2019-106898 [Patent Document 2] Japanese Patent Laid-Open No. 11-000086

[Problem to be solved by the invention]

In the prior art, when the diameter of the spool is increased, the diameter of the rotor for winding the fishing line around the spool is also increased. Therefore, in order to secure a space allowing the rotor to rotate, it is necessary to increase the distance from the fishing rod attachment leg to the frame. That is, the spinning reel has a problem of increasing in size due to the increase in the diameter of the bobbin.

Also, if the reciprocating stroke of the spool is extended, the length in the front-back direction of the reciprocating mechanism increases. Therefore, in order to house this reciprocating mechanism, it is necessary to enlarge the frame body. That is, due to the increase in the stroke amount of the reciprocating movement of the bobbin, there arises a problem of increasing the size of the frame portion, that is, the spinning reel.

On the other hand, compared with the above-mentioned technique, in the case of thinning the winding pitch of the fishing line, it is more effective in suppressing the enlargement of the spinning reel. However, the finer the winding pitch of the fishing line, the more complicated the structure such as a reduction mechanism with a large reduction ratio, or the difficult-to-manufacture parts such as a worm shaft with a thinner wall thickness between grooves must be prepared. That is, there arises a problem that the structure of the spinning reel becomes complicated, or the manufacturing cost of the spinning reel becomes high.

For example, as an aspect of configuring the above-mentioned speed reduction mechanism with a large reduction ratio with a simple gear train, it is conceivable to configure the gears with small modules. However, when the gear is composed of small modules, it is necessary to design the gear while considering the strength of the gear. Therefore, in order to design an appropriate gear according to the thickness of the fishing line and the size of the reel, it is necessary to carry out multiple trial productions and carry out complicated strength calculations.

As such, the prior art for solving the problem of dead spots has various problems as described above.

Therefore, in the present invention, a basic structure useful in designing a reciprocating mechanism and a bobbin is proposed. That is, in the present invention, a reference value for designing the reciprocating mechanism and the bobbin is set, and the reciprocating mechanism and the bobbin are designed using the reference value.

SUMMARY OF THE INVENTION An object of the present invention is to provide a spinning reel having a basic structure capable of properly solving the problems of the conventional spinning reels. [Technical means to solve the problem]

A spinning reel according to one aspect of the present invention has a spool shaft, a spool, a pinion, a reciprocating mechanism, and an intermediate gear. The spool shaft is supported so as to be movable in the front-back direction with respect to the cord reel body. The spool is coupled to the spool shaft. The fishing line is wound around the spool. The pinion is rotatably supported by the cord reel body. The reciprocating mechanism reciprocates the spool shaft in the front-rear direction.

The intermediate gear is disposed between the pinion gear and the reciprocating mechanism. The intermediate gear decelerates the rotation of the pinion and transmits it to the reciprocating mechanism. The value obtained by dividing the stroke of the spool shaft by the winding pitch of the fishing line and the module of the intermediate gear is 60 or more.

This spinning reel is composed of the stroke amount of the spool shaft divided by the winding pitch of the fishing line and the module of the intermediate gear, and the value obtained is more than 60. By designing the reciprocating mechanism and the bobbin using this configuration, the problems of the conventional spinning reel can be appropriately solved.

In the spinning reel of other aspects of the present invention, it is preferable that the value obtained by dividing the stroke of the spool shaft by the winding pitch of the fishing line and the module of the intermediate gear is 150 or less.

In the spinning reel of another aspect of the present invention, the winding pitch is preferably 1.0 mm or less.

In the spinning reel according to another aspect of the present invention, the spool preferably has a spool body around which the fishing line is wound, and a front flange extending radially outward from the front end of the spool body. In this case, the outer diameter of the front flange is less than 60 mm.

In the spinning reel according to another aspect of the present invention, it is preferable that the intermediate gear has a first intermediate gear and a second intermediate gear. Select the smaller module in the module of the first intermediate gear and the module of the second intermediate gear as the module of the intermediate gear.

The first intermediate gear is arranged to be rotatable around a first shaft parallel to the bobbin shaft. The first intermediate gear has a first large-diameter gear meshed with the pinion gear, and a first small-diameter gear that is smaller in diameter than the first large-diameter gear and rotates integrally with the first large-diameter gear.

The second intermediate gear is provided to be rotatable around a second axis parallel to the first axis. The second intermediate gear has a second large-diameter gear that meshes with the first small-diameter gear, and a second small-diameter gear that is smaller in diameter than the second large-diameter gear and rotates integrally with the second large-diameter gear. The reciprocating mechanism has a driven gear meshing with the second small-diameter gear, and a worm shaft that rotates integrally with the driven gear. With this configuration, since the fishing line can be wound on the spool while slowing down the movement of the spool shaft in the front-back direction, the problems of the conventional spinning reel can be properly solved with a relatively simple structure. [Effect of Invention]

The spinning reel of the present invention can suitably solve the problems of the previous spinning reels.

A spinning reel 1 according to an embodiment of the present invention includes a reel body 3 , a handle 5 , a spool 7 , and a rotor 9 as shown in FIG. 1 . As shown in FIG. 2 , the spinning reel 1 further includes a handle shaft 11 , a drive gear 13 , a spool shaft 15 , a pinion 17 , a reduction mechanism 19 , and a swing mechanism 21 (an example of a reciprocating mechanism). In addition, Fig. 2 is a diagram showing the side cover 1a and the main body protective cover 1b of the spinning reel 1 shown in Fig. 1 .

As shown in FIG. 1 , the handle 5 is rotatably supported by the cord reel body 3 . In this embodiment, an example of a case where the handle 5 is arranged on the left side of the cord reel body 3 is shown. The handle 5 can also be arranged on the right side of the cord reel body 3 . The handle 5 is attached to a handle shaft 11 .

As shown in FIG. 2 , the handle shaft 11 is rotatably supported by the cord reel body 3 . The drive gear 13 is attached to the handle shaft 11 so as to be rotatable integrally with the handle shaft 11 . The drive gear 13 meshes with the pinion gear 17 .

A fishing line is wound around the spool 7 . As shown in FIG. 2 , the spool 7 is configured to be movable in the front-rear direction with the spool shaft 15 relative to the reel body 3 . The spool 7 is connected to the spool shaft 15 . For example, the spool 7 is coupled to the front end of the spool shaft 15 via a pulling mechanism not shown.

The spool 7 has a central axis X2. When the spool 7 is connected to the spool shaft 15, the central axis X2 of the spool 7 is coaxial with the spool axis X1 described later.

As shown in FIG. 3 , the spool 7 has a spool body portion 7a, a front flange 7b, and a skirt portion 7c. A fishing line is wound around the outer circumference of the line reel trunk portion 7a. The bobbin trunk portion 7a is formed in a cylindrical shape. The front flange 7b extends radially outward from the front end of the bobbin trunk portion 7a. The front flange 7b is formed integrally with the bobbin barrel 7a. The front flange 7b is formed in a disc shape. The front flange 7b has an outer diameter R. The outer diameter R of the front flange 7b is defined by the outer peripheral surface 7b1 of the front flange 7b. A spool collar 10 is disposed radially outside the front flange 7b (see FIG. 2 ). The spool collar 10 covers the outer peripheral surface 7b1 of the front flange 7b.

The skirt portion 7c is formed integrally with the rear end of the bobbin trunk portion 7a. The skirt portion 7c has a rear flange 7c1 and a cylindrical portion 7c2. The rear flange 7c1 extends radially outward from the rear end of the bobbin barrel 7a. The rear flange 7c1 is formed integrally with the bobbin barrel 7a. The rear flange 7c1 is formed in a disc shape. The cylindrical portion 7c2 extends rearward from the outer peripheral portion of the rear flange 7c1. The cylindrical portion 7c2 is integrally formed with the rear flange 7c1. The cylindrical part 7c2 is formed in a cylindrical shape.

As shown in FIG. 2 , the spool shaft 15 is supported so as to be movable in the front-rear direction with respect to the reel body 3 . The spool shaft 15 is inserted through the inner peripheral portion of the cylindrical pinion 17 . The spool shaft 15 reciprocates in the front-back direction relative to the spool body 3 by the operation of the swing mechanism 21 .

The spool shaft 15 has a spool axis X1. The front-rear direction and the axial direction are the directions in which the axis X1 of the spool extends. The radial direction is the direction away from the axis X1 of the bobbin. The circumferential direction and the rotational direction refer to the direction around the axis X1 of the reel.

The swing mechanism 21 moves the spool shaft 15 in the front-rear direction. For example, the swing mechanism 21 moves the spool shaft 15 in the front-back direction in conjunction with the rotation of the handle shaft 11 . The swing mechanism 21 is disposed in the inner space of the cord reel body 3 .

As shown in FIGS. 2 and 4 , the swing mechanism 21 has a worm shaft 23 , a slider 25 , and a worm shaft gear 27 (an example of a driven gear). The worm shaft 23 rotates to move the spool shaft 15 and the slider 25 in the front-rear direction. The worm shaft 23 is arranged parallel to the spool shaft 15 . The worm shaft 23 is rotatably supported by the cord reel body 3 . The worm shaft 23 has a rotation axis W1.

The worm shaft 23 has a shaft body 23a and a groove portion 23b. The shaft body 23a is a shaft member that is longer in one direction. The shaft body 23a extends in the axial direction where the rotation axis W1 extends. The groove portion 23b is provided on the outer peripheral surface of the shaft body 23a. The claw member 26 mentioned later is engaged with the groove part 23b.

The slider 25 is attached to the spool shaft 15 . For example, the slider 25 is fixed to the rear end of the spool shaft 15 . The slider 25 moves in the front-rear direction by the rotation of the worm shaft 23 .

For example, as shown in FIG. 4 , claw members 26 are attached to the slider 25 . The claw member 26 is rotatably attached to the spool shaft 15 and the slider 25 . The claw member 26 is engaged with the groove portion 23 b of the worm shaft 23 . Thereby, when the worm shaft 23 rotates, the claw member 26 moves along the groove portion 23 b of the worm shaft 23 . Thereby, the slider 25 moves in the front-back direction.

As shown in FIGS. 2 and 4 , the worm shaft gear 27 is attached to the worm shaft 23 . For example, the worm shaft gear 27 has a rotation axis W2. The worm shaft gear 27 is attached to the worm shaft 23 so that the rotation axis W2 of the worm shaft gear 27 is concentric with the rotation axis W1 of the worm shaft 23 . The worm shaft gear 27 rotates integrally with the worm shaft 23 .

As shown in FIG. 4 , the worm shaft gear 27 has a gear body 27 a and an insertion hole 27 b. The gear body 27a is formed in a disc shape. The gear body 27a meshes with a second small-diameter gear 33b (described later) of the reduction mechanism 19 .

The insertion hole 27b is provided in the gear main body 27a. For example, the insertion hole 27b penetrates through the gear body 27a in the axial direction in which the rotation axis W2 of the worm shaft gear 27 extends. The worm shaft 23 is inserted through the insertion hole 27b. In this state, the worm shaft 23 and the worm shaft gear 27 rotate integrally.

As shown in FIG. 2 , the pinion gear 17 is formed in a cylindrical shape. The pinion 17 is rotatably supported by the cord reel body 3 . The pinion gear 17 is disposed radially outside the spool shaft 15 . The pinion 17 rotates relative to the spool shaft 15 . The pinion 17 rotates around the spool axis X1.

As shown in FIG. 5 , the deceleration mechanism 19 decelerates the rotation of the pinion gear 17 and transmits it to the swing mechanism 21 . The gear teeth of each gear are omitted in FIG. 5 . The parts where the respective gears mesh with each other are hatched.

The reduction mechanism 19 is disposed between the pinion gear 17 and the swing mechanism 21 . For example, the reduction mechanism 19 is disposed between the pinion gear 17 and the worm shaft gear 27 . The reduction mechanism 19 has a first intermediate gear 31 and a second intermediate gear 33 .

The first intermediate gear 31 is provided so as to be rotatable around a first axis A1 parallel to the axis X1 of the spool. The first intermediate gear 31 is rotatably supported by the cord reel body 3 . The first intermediate gear 31 has a first module M1. The first module M1 is calculated by dividing the diameter d1 of the pitch circle of the first intermediate gear 31 by the number of teeth z1 of the first intermediate gear 31 . This calculation formula is expressed by "M1=d1/z1". In FIG. 5, the lead-out line which shows the number z1 of teeth of the 1st intermediate gear 31 is shown by the dotted line of two dots.

The first intermediate gear 31 has a first large-diameter gear 31a and a first small-diameter gear 31b. The first large-diameter gear 31 a meshes with the pinion gear 17 . The rotation axis center of the first large-diameter gear 31a is the first axis A1. The first small-diameter gear 31b is formed to have a smaller diameter than the first large-diameter gear 31a. The 1st small-diameter gear 31b is integrally formed with the 1st large-diameter gear 31a, and rotates integrally with the 1st large-diameter gear 31a. The rotation axis center of the first small-diameter gear 31b is the first axis A1.

The second intermediate gear 33 is provided rotatably around a second axis A2 parallel to the first axis A1. The second intermediate gear 33 is rotatably supported by the cord reel body 3 . The second intermediate gear 33 has a second module M2. The second module M2 is calculated by dividing the diameter d2 of the pitch circle of the second intermediate gear 33 by the number of teeth z2 of the second intermediate gear 33 . This calculation formula is expressed by "M2=d2/z2". In FIG. 5, the lead-out line which shows the number z2 of teeth of the 2nd intermediate gear 33 is shown by the dotted line of two dots.

The second intermediate gear 33 has a second large-diameter gear 33a and a second small-diameter gear 33b. The second large-diameter gear 33a meshes with the first small-diameter gear 31b. The rotation axis center of the second large-diameter gear 33a is the second axis A2. The second small-diameter gear 33b is formed to have a smaller diameter than the second large-diameter gear 33a. The second small-diameter gear 33b is integrally formed with the second large-diameter gear 33a, and rotates integrally with the second large-diameter gear 33a. The rotation axis center of the second small-diameter gear 33b is the second axis A2. The second small-diameter gear 33 b meshes with the worm shaft gear 27 .

When the handle shaft 11 is rotated by the rotating operation of the handle 5, the driving gear 13 is rotated. The rotation of the drive gear 13 is transmitted to the pinion gear 17 . The rotation of the pinion gear 17 is transmitted to the worm shaft gear 27 through the above-mentioned reduction mechanism 19 . The rotation of the worm shaft gear 27 is transmitted to the worm shaft 23 . By the rotation of the worm shaft 23, the slider 25 and the spool shaft 15 move in the front-rear direction.

As shown in FIGS. 1 and 2 , the rotor 9 is used to wind the fishing line around the spool 7 . The rotor 9 is disposed at the front of the cord reel body 3 . The rotor 9 is configured to be rotatable relative to the cord reel body 3 . The rotor 9 is disposed radially outside the pinion 17 . The rotor 9 is mounted to be integrally rotatable with respect to the pinion 17 .

When the handle shaft 11 is rotated by the rotating operation of the handle 5, the driving gear 13 is rotated. The rotation of the drive gear 13 is transmitted to the pinion gear 17 . The rotor 9 rotates in conjunction with the rotation of the pinion 17 .

The spinning reel 1 having the above configuration is configured as follows. The outer diameter R of the flange 7b before shown in Fig. 3 and Fig. 6 does not reach 60 mm. For example, the outer diameter R of the front flange 7b is preferably greater than or equal to 35 mm and less than 60 mm. The outer diameter R of the front flange 7b is more preferably 40 mm or more and less than 56 mm. The outer diameter R of the front flange 7b is defined by the outer peripheral surface 7b1 of the front flange 7b.

The winding pitch P of the fishing line is 1.0 mm or less. For example, the winding pitch P of the fishing line is preferably not less than 0.4 mm and not more than 1.0 mm. More desirably, the winding pitch P of the fishing line is preferably not less than 0.55 mm and not more than 0.90 mm. The fishing line winding pitch P is the axial distance between adjacent fishing lines on the line winding body 7a.

In addition, the thread winding pitch P is determined according to the structure of the swing mechanism 21 and is not fixed. Therefore, the average wire coiling pitch is used as the wire coiling pitch P here. The average wire winding pitch is the value (2S/N) obtained by dividing the reciprocating travel distance (2S) by the number of times (N) the rotor 9 rotates during the reciprocating period of the bobbin 7 once.

The stroke S of the spool shaft 15 is divided by the winding pitch P of the fishing line, and the smaller module M of the first module M1 of the first intermediate gear 31 and the second module M2 of the second intermediate gear 33 is obtained. The value (S/(P·M)) is more than 60. The stroke S of the spool shaft 15 is divided by the winding pitch P of the fishing line, and the first module M1 of the first intermediate gear 31 and the second intermediate gear 33 The value obtained by the smaller module M in the second module M2 (S/(P·M) is less than 150. These relationships are expressed by the relationship "60≦(S/(P·M)≦150" .

As shown in FIG. 6 , the stroke amount S of the spool shaft 15 is the amount of movement of the spool shaft 15 in the front-rear direction by the swing mechanism 21 . The stroke amount S of the spool shaft 15 is preferably not less than 12 mm and not more than 25 mm. The stroke amount S of the spool shaft 15 is more preferably not less than 13 mm and not more than 23 mm.

Fig. 7 shows the spinning reel 1 (using models 1 and 2) of the present invention, the spinning reel 1 (comparative model 3) of the present invention that can be used by changing the parameters of the models 1 and 2, and has In previous spinning reels (previous models 1 to 3) with an intermediate gear or a gear equivalent to the intermediate gear, the above-mentioned numerical values and comprehensive evaluation of throwing and winding were displayed in tabular form.

The "Comprehensive Evaluation of Throwing and Winding" in Figure 7 is based on a pair of comparative test methods, and a plurality of testers perform the throwing and winding of each of the "size categories A, B, and C" of each spinning reel. (Fishing line coiling) sensory evaluation and ranking of quietness, extension feeling, coiling stability, etc. In addition, the symbols of "Comprehensive Evaluation of Throwing and Winding" use letters to represent size categories, and numerical values to represent the order of evaluation.

For example, in the size category A, the comprehensive evaluation A1 using model 1 is evaluated higher than the comprehensive evaluation A2 of the previous model 1. In the size category B, the comprehensive evaluation B1 using model 2 is evaluated higher than the comprehensive evaluation B2 of the previous model 2. In the size category C, the overall evaluation C1 of the comparison model 3 is higher than the overall evaluation C2 of the previous model 3 . Thus, the comprehensive evaluations A1, B1, and C1 of the adopted model 1, the adopted model 2, and the comparative model 3 obtain higher evaluations in each size category A, B, and C than the comprehensive evaluations A2, B2, and C2 of the previous model.

The above-mentioned spinning reel 1 has the following features. The spinning reel 1 is configured such that the value obtained by dividing the stroke S of the spool shaft 15 by the winding pitch P of the fishing line and the module M of the intermediate gears 31 and 33 (S/(P·M) is 60 or more By designing the swing mechanism 21 and the bobbin 7 using this configuration, the problems of the conventional spinning reel can be appropriately solved.

In the spinning reel 1, the value obtained by dividing the stroke S of the spool shaft 15 by the winding pitch P of the fishing line and the module M of the intermediate gears 31 and 33 (S/(P·M) is 150 or less. In the spinning reel 1, the winding pitch P is 1.0 mm or less. In the spinning reel 1, the outer diameter R of the front flange 7b is less than 60 mm. Since the spinning reel 1 has the first intermediate gear 31 and The second intermediate gear 33 can wind the fishing line around the reel trunk portion 7a while decelerating the spool shaft 15 in the front-rear direction. Thereby, the problems of the previous spinning reel can be properly solved with a relatively simple structure. . [Industrial availability]

The present invention is applicable to spinning reels.

1: Spinning reel 1a: side cover 1b: body shield 3: Reel body 5: Handle 7: Reel 7a: Winding trunk 7b: Front flange 7b1: Peripheral surface 7c: Skirt 7c1: rear flange 7c2: Cylindrical part 9: rotor 10: Spool Collar 11: handle shaft 13: Drive gear 15: Spool shaft 17: Pinion 19:Deceleration mechanism 21: Swing mechanism 23: worm shaft 23a: shaft body 23b: Groove 25: Slider 26: claw member 27: Worm shaft gear 27a: Gear body 27b: Through hole 31: 1st intermediate gear 31a: The first large diameter gear 31b: 1st small diameter gear 33: Second intermediate gear 33a: The second large diameter gear 33b: Second small diameter gear A1: 1st axis A2: 2nd axis d1: Diameter of the pitch circle of the first intermediate gear d2: Diameter of the pitch circle of the second intermediate gear M: module M1: Module of the 1st intermediate gear M2: The module of the second intermediate gear P: coiling pitch R: outer diameter of front flange S: stroke amount of spool shaft W1: axis of rotation W2: Rotation axis X1: the axis of the reel X2: Central axis z1: Number of teeth of the 1st intermediate gear z2: Number of teeth of the second intermediate gear

Fig. 1 is a side view of a spinning reel according to an embodiment of the present invention. Figure 2 is a side view of the side cover and the main body protective cover of the spinning reel. Figure 3 is a side view of the reel. Fig. 4 is an exploded perspective view for illustrating the swing mechanism. Fig. 5 is a side view for explaining the reduction mechanism. Fig. 6 is a side view for explaining the configuration for increasing the amount of winding of the fishing line. Fig. 7 is a table showing various numerical values of the basic structure of the spinning reel of the present invention and the conventional spinning reel, and a comprehensive evaluation of throwing and winding.

P: coiling pitch

R: outside diameter of front flange

S: stroke amount of spool shaft

Claims (5)

A spinning wheel reel, which has: a spool shaft supported so as to be movable in a front-rear direction relative to the above-mentioned spool body; a spool connected to the spool shaft and wound with a fishing line; a pinion rotatably supported by said cord reel body; a reciprocating mechanism for reciprocating the spool shaft in the fore-and-aft direction; and an intermediate gear arranged between the pinion gear and the reciprocating mechanism, and decelerates the rotation of the pinion gear and transmits it to the reciprocating mechanism; and The value obtained by dividing the stroke of the above-mentioned spool shaft by the winding pitch of the above-mentioned fishing line and the module (diameter of pitch circle/number of teeth) of the above-mentioned intermediate gear is 60 or more. Such as the spinning wheel type reel of claim 1, wherein The above value is 150 or less. Such as the spinning reel of claim 1 or 2, wherein The above-mentioned winding pitch is 1.0 mm or less. The spinning wheel reel according to any one of claims 1 to 3, wherein The spool has a spool body around which the fishing line is wound, and a front flange extending radially outward from the front end of the spool body; and The outer diameter of the above-mentioned front flange is less than 60 mm. The spinning reel according to any one of claims 1 to 4, wherein The intermediate gear has a first intermediate gear and a second intermediate gear; Select the smaller module among the above-mentioned first intermediate gear module and the above-mentioned second intermediate gear module as the above-mentioned module of the above-mentioned intermediate gear; The first intermediate gear is provided to be rotatable around a first axis parallel to the axis of the spool, and has a first large-diameter gear meshed with the pinion gear, and a gear with a diameter smaller than the first large-diameter gear and aligned with the first large-diameter gear. The first small-diameter gear that rotates with the large-diameter gear; The second intermediate gear is arranged to be rotatable around a second axis parallel to the first axis, and has a second large-diameter gear meshed with the first small-diameter gear, and has a smaller diameter than the second large-diameter gear and is connected to the second large-diameter gear. The second small-diameter gear that rotates integrally with the above-mentioned second large-diameter gear; and The reciprocating mechanism has a driven gear meshing with the second small-diameter gear, and a worm shaft integrally rotating with the driven gear.

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